Formed by a pore completely blocked with dead skin cells and sebum. Since no air can get into a completely plugged pore, it won’t get dark, like a blackhead.
Formed by a pore partially plugged with sebum and dead skin cells. The surface turns black mainly because of a chemical reaction of the plug with air.
A small, inflamed, bump topped by a white or yellow pus-filled lesion that may be red at the base. Differs from a papule because of the pus located in the center of the lesion.
A small, inflamed bump that usually appears as small, pink bump on the skin, which can be tender to the touch. Also referred to as a pimple. Papules do not have pus at the center of the lesion.
Or pseudocyst, is a large, dome-shaped swelling, filled with pus, that’s usually inflamed and painful. Can become infected and cause scarring.
A painful red lump that’s larger than a pimple and lodged deep within the skin. Usually occurs with severe acne and can lead to scarring.
Dermatologists grade common facial acne into three levels of severity.
Less than 20 blackheads and/or whiteheads. Less than 15 pimples (pustules or papules).
20 to 100 blackheads and whiteheads, plus 15 to 50 pimples (pustules or papules).
Over 100 blackheads and whiteheads, over 50 pimples and over 5 cysts or nodules.